Episodes

With all of the black-and-white moralizing in our world today, we decided to bring back an old show about the little bit of bad that's in all of us...and the little bit of really, really bad that's in some of us.
Cruelty, violence, badness... in this episode we begin with a chilling statistic: 91% of men, and 84% of women, have fantasized about killing someone. We take a look at one particular fantasy lurking behind these numbers, and wonder what this shadow world might tell us about...

If there’s one thing Gonads taught us, it’s just how complicated human reproduction is. All the things we thought we knew about biology and sex determination are up for debate in a way that feels both daunting and full of potential. At the same time, we're at a moment where we’re wrestling with how to approach conversations around sex, consent, and boundaries, at a time that may be more divisive than ever. So host Molly Webster thought: what if we took on sex ed, and tried to tackle...

When Dana Zzyym applied for their first passport back in 2014, they were handed a pretty straightforward application. Name, place of birth, photo ID -- the usual. But one question on the application stopped Dana in their tracks: male or female? Dana, technically, wasn’t either.
In this episode, we follow the story of Dana Zzyym, Navy veteran and activist, which starts long before they scribble the word "intersex” on their passport application. Along the way, we see what happens when our...

In 2014, India’s Dutee Chand was a rising female track and field star, crushing national records. But then, that summer, something unexpected happened: she failed a gender test. And was banned from the sport. Before she knew it, Dutee was thrown into the middle of a controversy that started long before her, and continues on today: how to separate males and females in sport.
This story is a companion piece to Gonads, Episode 5, Dana.
"Dutee" was reported by Molly Webster, with co-reporting...

A lot of us understand biological sex with a pretty fateful underpinning: if you’re born with XX chromosomes, you’re female; if you’re born with XY chromosomes, you’re male. But it turns out, our relationship to the opposite sex is more complicated than we think.
This episode was reported by Molly Webster, and produced by Matt Kielty. With scoring, original composition and mixing by Matt Kielty and Alex Overington. Additional production by Rachael Cusick, and editing by Pat Walters. The...

At 28 years old, Annie Dauer was living a full life. She had a job she loved as a highschool PE teacher, a big family who lived nearby, and a serious boyfriend. Then, cancer struck. Annie would come to find out she had Stage 4 non-Hodgkin's lymphoma. It was so aggressive, there was a real chance she might die. Her oncologists wanted her to start treatment immediately. Like, end-of-the-week immediately. But before Annie started treatment, she walked out of the doctor’s office and crossed the...

At two weeks old, the human embryo has only just begun its months-long journey to become a baby. The embryo is tiny, still invisible to the naked eye. But inside it, an epic struggle plays out, as a nomadic band of cells marches toward a mysterious destiny, with the future of humanity resting on their microscopic shoulders.
This episode was reported by Molly Webster, and produced by Jad Abumrad. With scoring and original composition by Alex Overington and Dylan Keefe. Additional production...

We originally posted this episode in 2015, and it inspired producer Molly Webster to take a deep dive into the wild and mysterious world of human reproduction. Starting next week, she’ll be taking over the Radiolab podcast feed for a month to present a series of mind-bending stories that make us rethink the ways we make more of us.
You know the drill - all it takes is one sperm, one egg, and blammo - you got yourself a baby. Right? Well, in this episode, conception takes on a new form -...

When reporter Brenna Farrell was a new mom, her son gave her and her husband a scare -- prompting them to call Poison Control. For Brenna, the experience was so odd, and oddly comforting, that she decided to dive into the birth story of this invisible network of poison experts, and try to understand the evolving relationship we humans have with our poisonous planet. As we learn about how poison control has changed over the years, we end up wondering what a place devoted to data and human...

This week, we're throwing it back to an old favorite: a story about obsession, creativity, and a strange symmetry between a biologist and a composer that revolves around one famously repetitive piece of music.
Anne Adams was a brilliant biologist. But when her son Alex was in a bad car accident, she decided to stay home to help him recover. And then, rather suddenly, she decided to quit science altogether and become a full-time artist. After that, her husband Robert Adams tells us, she just...

Seven years ago chatbots - those robotic texting machines - were a mere curiosity. They were noticeably robotic and at their most malicious seemed only capable of scamming men looking for love online. Today, the chatbot landscape is wildly different. From election interference to spreading hate, chatbots have become online weapons.
And so, we decided to reinvestigate the role these robotic bits of code play in our lives and the effects they’re having on us. We begin with a little theater....

Alecia Faith Pennington was born at home, homeschooled, and never visited a dentist or a hospital. By both chance and design she is completely invisible in the eyes of the state. We follow Faith as she struggles to free herself from one restrictive world only to find that she is trapped in another. In her journey to prove her American citizenship she attempts to answer the age-old question: who am I?
Radiolab then follows the story of David Weinberg, a man who found himself stuck. He had...

Astronauts at the International Space Station can make one request to talk to an earthling of their choice. For some reason, Astronaut Mark Vande Hei chose us. A couple weeks ago, we were able to video chat with Mark and peer over his shoulder through the Cupola, an observatory room in the ISS. Traveling at 17,000 miles an hour, we zoomed from the Rockies to the East Coast in minutes. And from where Mark sits, the total darkness of space isn’t very far away.
Talking to Mark brought us back...

Border Trilogy
While scouring the Sonoran Desert for objects left behind by migrants crossing into the United States, anthropologist Jason De León happened upon something he didn't expect to get left behind: a human arm, stripped of flesh.
This macabre discovery sent him reeling, needing to know what exactly happened to the body, and how many migrants die that way in the wilderness. In researching border-crosser deaths in the Arizona desert, he noticed something surprising. Sometime in the...

Border Trilogy
While scouring the Sonoran Desert for objects left behind by migrants crossing into the United States, anthropologist Jason De León happened upon something he didn't expect to get left behind: a human arm, stripped of flesh.
This macabre discovery sent him reeling, needing to know what exactly happened to the body, and how many migrants die that way in the wilderness. In researching border-crosser deaths in the Arizona desert, he noticed something surprising. Sometime in the...

Border Trilogy
While scouring the Sonoran Desert for objects left behind by migrants crossing into the United States, anthropologist Jason De León happened upon something he didn't expect to get left behind: a human arm, stripped of flesh.
This macabre discovery sent him reeling, needing to know what exactly happened to the body, and how many migrants die that way in the wilderness. In researching border-crosser deaths in the Arizona desert, he noticed something surprising. Sometime in the...

One of our most popular episodes of all time was our Colors episode, where we introduced you to a sea creature that could see a rainbow far beyond what humans can experience.
Peacock mantis shrimps are as extraordinary as they are strange and boast what may well be the most complicated visual system in the world. They each have 16 photoreceptors compared to our measly three. But recently researchers in Australia put the mantis shrimps’ eyes to the test only to discover that sure, they can...

The shooting in Parkland, Florida on February 14, 2018, reignited an increasingly familiar debate about guns in this country. Today, we’re re-releasing a More Perfect episode that aired just after the Las Vegas shooting last year that attempts to make sense of our country’s fraught relationship with the Second Amendment.
For nearly 200 years of our nation’s history, the Second Amendment was an all-but-forgotten rule about the importance of militias. But in the 1960s and 70s, a movement...

We don’t do breaking news. But when Robert Mueller released his indictment a few days ago, alleging that 13 Russian nationals colluded to disrupt the 2016 elections, we had a lot of questions. Who are these Russian individuals sowing discord? And who are these Americans that were manipulated?? Join us as we follow a trail of likes and tweets that takes us from a Troll Factory to a Cheesecake Factory.
This episode was produced by Simon Adler and Annie McEwen with reporting help from Becca...

Do you really need a brain to sense the world around you? To remember? Or even learn? Well, it depends on who you ask. Jad and Robert, they are split on this one. Today, Robert drags Jad along on a parade for the surprising feats of brainless plants. Along with a home-inspection duo, a science writer, and some enterprising scientists at Princeton University, we dig into the work of evolutionary ecologist Monica Gagliano, who turns our brain-centered worldview on its head through a series of...